Considering he didn't put you're, but rather you'r it seems to have been a typo. None the less let's dig into your sentence now.

um it's just your not you'r the word "your" is already showing ownership and therefor needs no apostrophe if you were to use an apostrophe it'd be in the world "you're meaning you are"

the more you know!!
Uhm, it's just your, not you'r. The word "your" shows ownership and therefor doesn't need an apstrophe. If you did use an apostrophe the word should be "you're" as in "you are an asshole for correcting this kid".
The more you know!